Recent Topics
Kawasaki FH641V issues
by Scooby
28 minutes 43 seconds ago
Getting grease out of a cartridge
by Ducked
Today at 02:11 AM
Honda Civic 1.8 engine block cracking....
by gregk24
Today at 01:55 AM
Failed AC compressor
by Ndx
Today at 12:39 AM
Transmission cooler lines - 4t45e
by GpB311
Today at 12:37 AM
radiator deterioration?
by Leo99
Yesterday at 11:39 PM
Autotrak smurf fluid turned black
by RedOakRanch
Yesterday at 11:29 PM
Thoughts on 2014-2015 Corolla?
by gregk24
Yesterday at 10:17 PM
FS: Fram Sure Drain SD3 New Old Stock!
by IntegraVT
Yesterday at 10:06 PM
FS: K&N E-2429 Drop-In Air Filter for Honda/Acura
by IntegraVT
Yesterday at 09:53 PM
What kind of Oci?
by MotorsportsX
Yesterday at 09:45 PM
Safe to drive with no coolant?
by NMBurb02
Yesterday at 09:34 PM
Newest Members
CaryHsieh, sip_99, 4wheelnwld, RobertJM, RCRcer
54903 Registered Users
Who's Online
22 registered (alex16, DoubleWasp, ArrestMeRedZ, Bandito440, AdRock, dgunay), 533 Guests and 94 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
54903 Members
66 Forums
235258 Topics
3785028 Posts

Max Online: 2862 @ 07/07/14 03:10 PM
Donate to BITOG
Topic Options
#2835370 - 12/14/12 09:14 PM 1985 BMW 318i with M42 engine swap - oil suggest?
irish44j Offline


Registered: 09/26/06
Posts: 18
Loc: Burke, VA
I just swapped an M42 engine (from a later 318is) into my old 318i (used to have an M10).

Engine has been heavily refreshed but didn't rebuild, and using original pistons/valves, etc.

Mileage unknown, but compression is within factory spec.

Car is used primarily for rallycross from March to November, but also driven to events (about 70 miles highway) and driven on weekends for fun. I drive it hard. Almost always. This car isn't for leisurely cruising smile

I'm near Washington DC, but car is driven in the hot summer and cold winter here and there. Don't mind using different viscosities/oil seasonally though....

For my WRX I use Rotella T5 and/or T6 (depending on what's on sale), which I can get at wally-world of course.

Any suggestions on the best oil for the M42 in the BMW?

Top
#2835403 - 12/14/12 10:15 PM Re: 1985 BMW 318i with M42 engine swap - oil suggest? [Re: irish44j]
Seventh Offline


Registered: 11/11/12
Posts: 50
Loc: NorCal
Do you have an oil pressure gauge?

I ask because I've seen a few <200k mi M42/44 engines that would get some oil light flickering action in hot weather traffic while running a 30wt oil. I've also seen them go 300k mi on a strict diet of 20w-50 conventional... but sounding like a diesel.

Considering how you drive the car, I'd be inclined to recommend just using the T6 for simplicity's sake since you're already using it. Watch consumption and pressure if you can, and do a UOA or two to see if things look ok. I can't imagine they won't.
_________________________
'11 WRX E85 convert-31k-Eneos 5w40
'95 325i-commuter-176k-Caterham twist-UOA in 9k
'96 332ti-133k-DELO 5w40
'69 GTO 428ci-DELO 15w40
'58 F100 331ci-T5

Top
#2835415 - 12/14/12 10:33 PM Re: 1985 BMW 318i with M42 engine swap - oil suggest? [Re: irish44j]
JHZR2 Offline



Registered: 12/14/02
Posts: 35934
Loc: New Jersey
Rotella 5w40 is a great choice and Ive used it for years in my M42 in my 1991.

M1 HM 10w-40 is also a robust ACEA A3 oil that you might consider.

Top
#2835441 - 12/14/12 11:09 PM Re: 1985 BMW 318i with M42 engine swap - oil suggest? [Re: JHZR2]
irish44j Offline


Registered: 09/26/06
Posts: 18
Loc: Burke, VA
Thanks. Seventh - it will have an oil pressure gauge once I'm done with this swap and actually driving the car again.

Since I don't put many miles on the car so my OCI is pretty long, sounds like T6 will be the way to go, else t5. Thanks.

Top
#2835447 - 12/14/12 11:21 PM Re: 1985 BMW 318i with M42 engine swap - oil suggest? [Re: irish44j]
JHZR2 Offline



Registered: 12/14/02
Posts: 35934
Loc: New Jersey
I wouldnt run T5 in it. IMO 30wt is a bit too light for the engine.

There was a time when MB for example would spec the HD or more robust version of the oils and only allow the lighter variant for really low temperatures, when the oils were low viscosity (like a 30wt).

In older manuals, 30wt is only allowable at really cold temps, in newer ones, 30wt was allowed only at really low temperatures, unless it was what is now the precusror to ACEA A3.

So if the HTHS of T5 is high enough to qualify for ACEA A3, you might consider using it... But Im not sure it would meet this.

Your selection aligns to this:



SPecial oils are in my interpretation, wider viscosity synthetics, but the basic premise of 40 or 50wt still stands.

Top
#2835465 - 12/15/12 12:44 AM Re: 1985 BMW 318i with M42 engine swap - oil suggest? [Re: irish44j]
dparm Offline


Registered: 04/19/10
Posts: 12612
Loc: Chicago, IL
I would run any quality 5w40 and call it a day. T6 is a good value oil, as are pretty much any of the other 5w40 HDEOs.
_________________________
2011.5 BMW M3 saloon ZCP
der stärkste buchstabe der welt
Castrol Edge Professional TWS 10w60 + Mahle OX 254D3

Top
#2835574 - 12/15/12 07:27 AM Re: 1985 BMW 318i with M42 engine swap - oil suggest? [Re: irish44j]
fdcg27 Offline


Registered: 09/25/09
Posts: 10927
Loc: OH
Mine seems to do very well with Maxlife 10W-40.
Either the green or the red bottle would be appropriate.
I had a very good UOA using Maxlife Nextgen 10W-40 for 4K last summer.
_________________________
12 Accord LX 36K PP 0W-20
09 Forester 67K PU 5W-30
02 Accord 144K GOil 5W-30
01 Focus ZX3 101K Meijer Syn 5W-20
95 BMW 318iC 150K Defy 10W-40

Top
#2835698 - 12/15/12 10:27 AM Re: 1985 BMW 318i with M42 engine swap - oil suggest? [Re: irish44j]
KCJeep Offline


Registered: 06/30/11
Posts: 5693
Loc: Mahzurrah!
The Rotella 30 wts have an HTHS of 3.5, on the thick side for 30's and right at the level recommended for many German cars, but I wouldn't run a generic PCMO 30 in it the HTHS would be 3.0-3.1 for most of them.
_________________________
2004 Jeep GC WJ 4.0 @ 127k Pennzoil YB SAE 30 w/MMO
Motorcraft FL-1A
KIA Sedona 49k, Chevy Lumina 177k, Chrysler Sebring 181k, Chrysler Concorde 105k

Top
#2835734 - 12/15/12 11:12 AM Re: 1985 BMW 318i with M42 engine swap - oil suggest? [Re: KCJeep]
Seventh Offline


Registered: 11/11/12
Posts: 50
Loc: NorCal
Originally Posted By: KCJeep
The Rotella 30 wts have an HTHS of 3.5, on the thick side for 30's and right at the level recommended for many German cars, but I wouldn't run a generic PCMO 30 in it the HTHS would be 3.0-3.1 for most of them.


T5 is a great oil, and I completely agree with this statement, however the oil light flickering I spoke about was on M42/44 cars running the BMW synthetic, which is also 3.5 HTHS.

He will be better informed with pressure and temp gauges, but I still wouldn't run any 30wt oil in that car during warmer months if it's getting thrashed like the he suggests. $.02
_________________________
'11 WRX E85 convert-31k-Eneos 5w40
'95 325i-commuter-176k-Caterham twist-UOA in 9k
'96 332ti-133k-DELO 5w40
'69 GTO 428ci-DELO 15w40
'58 F100 331ci-T5

Top
#2835916 - 12/15/12 02:36 PM Re: 1985 BMW 318i with M42 engine swap - oil suggest? [Re: irish44j]
OVERKILL Offline


Registered: 04/28/08
Posts: 29397
Loc: Ontario, Canada
M1 0w40 or D1 5w40 would be good choices as well here.
_________________________
Network Engineer
02 Expedition
06 Charger R/T
14 Charger SRT-8

Top